Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b4bcead1a4f50b…

MALICIOUS

PDF

70.4 KB Created: 2021-09-03 09:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3a64adc16bce2b192c9628459a41939f SHA-1: 59512f6c4b46b5718fedb9c51d0841e088e51b69 SHA-256: 78b4bcead1a4f50bb4ea99d7f87ab24c10a380a9ac98a390cea63b163b9db4f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://74ahs.com/clients/2/2a/2a132ee8da0778863662fd4b1fa251ed/File/gorenajum.pdf In PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971bf56c735---63287411614.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/7e8f8bf06f7ac875636e89812dd332e2/satazibedabawa.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/a16f21c1f97a2a86c81375d695079f16/pebuzetosikuxetedowedewe.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/13013423864.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/gabolona.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/mizugusiwelojuwufadipo.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/40811411671.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021062414202270.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092dd31e58cc---57602040282.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/runubexewexijubitedi.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607c010543945---xufeduruvoli.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/bawiwukutojovolowowok.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/mikata.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/9823495183.pdfIn PDF document text
    • http://crm333.com/documentos/file/gasowodalaziw.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3fe7e4705---89260477568.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/vpa1ocu21vef377oj2cl9gk41u/kukepeneliloxorejizavete.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/d766f3a92f975a003fd8e11df08611ee/xemagavorixamavalulilu.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/22852036968.pdfIn PDF document text
    • http://varanini.pl/userfiles/file/menijodedu.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8e117e5e9---38214328295.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846483414f7---dipogizomaz.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/51135602959.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=transition+words+middle+school+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5CE 10932 bytes
SHA-256: 835d891ea84b0ca8696b9874813e832d950a5797b2b53241bec980ec09b875f9
font_01_sfnt_off0000cefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFD 14756 bytes
SHA-256: 7e3f914e56540ca2c1b8ec1c5001ac22f7e09768b95f5926f306dc3e54bee8ba
font_02_sfnt_off0000f3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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